forster



(No Model.) 2 SheetsSheet 1.

J. F. PURSTBR.

DOOR BUFFER.

\ No. 603,785. Patented May 10,1898.

O O ,i h 4 2 SheetsSheet 2.

(No Model.) f

J. F. PORSTER.

DOOR BUFFER. No. 603,785. 7 Patented MaylO, 1898.

:i f l T Wflnesses Inve llnr MM/JQaZQm UNITED STATES PATENT OFFICE.

JULIUS FUROHTEGOTT FORSTER, OF LEIPSIC, GERMANY, ASSIGNOR TO EMIL OSCARBEYER, OF SAME PLACE.

DOOR-BUFFER.

SPECIFICATION forming part of Letters Patent No. 603,785, dated May 10,1898.

Application filed October 2, 1897- Serial No. 653,805. (No model.)

To all whom it may concern.-

Be it known that I, JULIUS Fiinonrneor'r FORSTER, a subject of the Kingof Saxony, and a resident of Leipsic-Lindenau, in the Kingdom of Saxony,Germany, haveinvented certain new and useful Improvements inDoor-Buffers, of which the followingis a full, clear, and exactdescription.

Thepresent invention consists of a buffer for preventing doors fromslamming.

The buffer is constructed so that when the door is slammed or shutsomewhat violently it will strike the said buffer, the concussion of theblow being utilized to immediately remove the bufier out of the path ofthe door, so that the latter may be gently closed.

In order to render the present specification more easily intelligible,reference is had to the accompanying drawings, in which similar lettersof. reference denote similar parts throughout the several views.

Figure l is a front elevation of the device, showing the door closed;Fig. 2, a similar elevation with the door partly open; Fig. 3, a frontelevation of the device detached and drawn to a larger scale, the partsbeing in the position they occupy when the door is closed. Fig. 4 is anend elevation of Fig. 3; Fig. 5, a section on line R R of Fig. 3; Fig.6, a front elevation of the device with the parts in position when thedoor is open; Fig. '7, an end elevation of Fig. 6, and Fig. 8 a sectionon line S S of Fig. 6.

The buffer, of soft yielding material, is attached to the end of asleeve A, arranged on a sliding pin t, mounted in the end of an angle orbell-crank lever B, pivoted at b to a base-plate O, attached to thedoor-frame in proximity to the d0or,.so that the buffer will lie in thepath of the door when the latter is closed, butmay be raised out of theway when the lever B is turned on its pivot. The upper arm of thebell-crank lever B is provided with-a pin which engages a slot 8 of arod S, connecting it to a bell-crank lever, Fig. 1, the lower arm ofwhich is coupled, as at S, to the hinge of the door and adapted to beraised when the door is opened. The manner in which the rod S is movedwhen the door is opened or closed is indifferent and forms no part ofthe present invention.

. ported on a pivot a, with its end in proximity to an inclined surfaceor cam g, fixed to the base-plate O. The opposite end of the said leverhis pivoted to the buffer slide-bar t. A coiled spring 76 is provided inconnection with the lever B, said spring normally serving to turn thesaid bell-crank lever B on its pivot in a direction to cause the bufferto lie out o the path of the door.

The device operates in the following manner: When the door is opened,the rod S acts to turn the lever B downwardly from the position shown atFig. 1 to that shown at Fig. 2, and thus to bring the buffer into thepath of the door. The lever is retained in this position against theaction of its spring k by the catch-lever h engaging behind the shoulderof the cam g, as shown at Fig. 6. When the door is closed, the bufferreceives the impetus and will be moved from the position shown" at Fig.8 to that shown at Fig. 5 against the action of the buffer-spring f.This movement of the buffer disengages the end of the catch-lever h frombehind the shoulder of the cam g, so that the lever B is free to turnupwardly on its pivot under the action of its spring 70. Thus as soon asthe door has depressed thebuffer the latter will be turned upwardly outof the path of the door, and the latter may be closed in the usualmanner.

I claim as my invention The combination of a bell-crank lever pivotallymounted on the door-frame in proximity to the door,a slide-pin in saidbell-cranklever end, having mounted thereon a springpressed buffer, acatch-lever pivoted to the said bell-crank-lever arm and having one endconnected to the slide-pin aforesaid, a cam mounted in proximity to theopposite end of said catch-lever, means for lowering the bufname to thisspecification in the presence 0 fer-arm of the bell-crank lever into thepath of two subscribing Witnesses. the door vyhen the latter 1s openedand means JULIUS FUROHTEGOTT FURSTER. for releasing the catch mechanismand rais- V 5 ing the said arm immediately the door has Witnesses:

struck the buffer substantially as described. HERM. SACK,

In testimony whereof I have signed my RUDOLPH FRIOKE.

